At present, there are economic, ecological and energy efficiency problems in dealing with the oil industry. We have tried to solve this problem through a solar thermal application. Thus, parabolic-trough solar plant utilization in the oil industry is a relatively new application in the area of solar energy usage. In Azerbaijan (Baki), such an application has firstly been realized in the crude oil treatment process by us. We must mention that a solar energy application has a great advantage for the oil industry to be economical with fossil fuels partly, to improve safety measures and ecology, and to also reduce additional financial expenses. Besides the ecological and economical facets, the obtained results from the experiments, which have been carried out in the Absheron Peninsula (Baki), are useful from an energy efficiency point of view in the field of solar thermal applications by using parabolic troughs. These experimental results are significant on account of economic, energy efficient and ecological advantages.